Hello,
I am seeing BW of ~192 MB/sec using RDMA Write as opposed to ~950MB/sec
using RDMA Read,
Any ideas?
Normally patches should be attached as "plain text"
Here is the svn diff to gen2/src/userspace/perftest/rdma_bw.c to make
it use RDMA Read instead or RDMA Write:
Index: rdma_bw.c
===================================================================
--- rdma_bw.c (revision 3134)
+++ rdma_bw.c (working copy)
@@ -299,7 +299,7 @@
}
ctx->mr = ibv_reg_mr(ctx->pd, ctx->buf, size * 2,
- IBV_ACCESS_REMOTE_WRITE);
+ IBV_ACCESS_LOCAL_WRITE |
IBV_ACCESS_REMOTE_WRITE | IBV_ACCESS_REMOTE_READ);
if (!ctx->mr) {
fprintf(stderr, "Couldn't allocate MR\n");
return NULL;
@@ -340,7 +340,7 @@
attr.qp_state = IBV_QPS_INIT;
attr.pkey_index = 0;
attr.port_num = port;
- attr.qp_access_flags = IBV_ACCESS_REMOTE_WRITE;
+ attr.qp_access_flags = IBV_ACCESS_REMOTE_WRITE |
IBV_ACCESS_REMOTE_READ;
if (ibv_modify_qp(ctx->qp, &attr,
IBV_QP_STATE |
@@ -664,7 +664,7 @@
ctx->wr.wr_id = PINGPONG_RDMA_WRID;
ctx->wr.sg_list = &ctx->list;
ctx->wr.num_sge = 1;
- ctx->wr.opcode = IBV_WR_RDMA_WRITE;
+ ctx->wr.opcode = IBV_WR_RDMA_READ;
ctx->wr.send_flags = IBV_SEND_SIGNALED;
ctx->wr.next = NULL;
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